Improved swaging-machine



J. H. TOBEY'l V Swaging Machine.

No. 55,790. Patented June 19, 1866.

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UNITED STATES PATENT OFFICE.

JAMES H. TOBEY, 0F CRANSTON, RHODE ISLAND, ASSIGNOR IO HIMSELF AND ALFRED E. TENNEY.

IMPROVED SWAGING-MACHINE.

Specification forming part of Letters Patent No. 55,790, dated June 19, 1866.

DIVISION A.

To all whom t may concern:

Be it known that I, JAMES H. ToBEY, of Cranston, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Machines for Swagin g Metal; and I do hereby declare that the followin g specification, taken in connection with the drawings making a part of the same, is a full, clear, and exact description thereof.

Figure 1 is a front elevation. Fig. 2 is a side elevation. Figs. 3, et, 5, and 6 relate to Division B of this patent.

The invention which is the subject of this patent relates toa machine which is specially adapted to strike up from sheet metal the halves of watch and locketcases, but can be usefully applied to various manufactures of sheet metal other than those mentioned.

rIhe invention resides in the use of aduplex plunger or former composed of two plungers or formers having coincident axes, one of which plungers surrounds theother and has a true reciprocating movement, derived from an eccentric orits equivalent, while the other has a variable movement, derived from acam or its equivaient, each plunger performing separate functions, bur both being combined with a die to effect the desired result of shaping the metal upon which they act.

The result to be accomplished is one that has hitherto been regarded as impossible, viz., the forming of the half of a watchor locket case, and by the same operation the inner rim or bezel, by upsetting the edge of the metal.

The methods hitherto employed to produce this article have all involved the operation of turning over the stock at the edge to form a bezel oraiield piece, either by the spinning process described in H. A. Phillips patent, dated January 7 ,A. D. 1857,0rby the successivedies process described in Reissue Patents Nos. S5() and 851, granted to Charles IV. Bloomer upon his patent of April 2S, A. D. 1857, the disadvantages of which processes are th at the metal at that part of the case has its fiber so broken that it is liable to crack and scale if subjected to much wear or strain.

In the accompanying drawings, A is a strong upright frame, capable of sustaining the strain lto which it will be subjected when the plungers are in operation, and arranged in any convenient way to afford the proper bearings for the several shafts presently to be described. Bis the table orbed-piece, upon which isplaced the die-block O.

' D and E are the two plungers referred to, constituting together the duplex former, arranged to work in suitable guides a a. The axes of the two plungers are coincident, and consequently fthe exterior plunger, D, is cylindrical to accommodate the central plunger, E, which works within it.

The eXteriorplun ger, D, is suitably connected, as shown in Fig. 2, with the eccentric F, or its equivalent, on the shaft F', which obtains its motion from the driving-pulley G, through the pinion G 5 and consequently, as the shaft- F revolves, a regular reciprocating movement will be given to the plunger D in a way familiar to all mechanics.

A pinion on the driving-shaft G communicares a rotary movement to the gear-wheel I-I, which is of the same size, and therefore 1evolves in the same time as the gear-wheel I upon the-shaft F.

Upon the shaft II of the gear-wheel H is keyed a cam, K, the purpose ofwhich is to give a movement to the interior plunger, E, through the bell-crank lever L, whose fulcrumis on the stud b in the frame. This bell-crank lever is jointed to the head of the plungerE, amortise or opening of sufficient size to accommodate it being cut through the shell of the outer plunger, D, as more fully shown at Fig. 1. Ihe longer arm of the lever is connected by alink,

M, and stud-pin m, Fig. 2, with the groove c in the side of the cam, from which it is obvious that a variable movement will be given to the plunger E, dependent entirely upon the conformation ofthe faces ofthe groove c in the cam, and that its periods of rest and motion, relatively to the motion of the plunger D, can be varied according to the necessities ofthe case.

Suppose, now, a suitably-prepared piece of sheet metal of the box-cover form shown in the die of Fig. 4 to be placed in the die C for the purpose of forming the halves of a watchcase, and the machine to be putin to operation. The plunger E will descend and, in combination with the die C, give the requisite shape to the central portion or bach of the case. The plun ger D will by this time have reached the die,l

and while the plunger E, from the shape of the cam which controls it, is made to rest and press upon the back of the Watch-case, the former upsets the rim and forms the bezel, the surface of the central plunger,E, and the sur face of the die G furnishing the necessari7 resistance on every'side to enable the plunger D to perfectly execute its Work. The result is that the case is formed with its solid bezel at a single operation and with a decree of accuracy which is of great importance when the two halves of the case come to be jointed, and which is unattainable by any other means.

The machine above described can be applied to the formation of various useful and orna- 

